“ Whereas it is a fundamental principle of our Government to protect the interests of individuals against unreasonable or unwarranted encroachment; and
Whereas I find that the provisions and procedures prescribed by this order are necessary to assure the preservation of the integrity of classified defense information and to protect the national interest ”

“ So far as the national security permits, the head of the investigative agency involved shall cooperate with the Secretary or the Administrator, as the case may be, in identifying persons who have made statements adverse to the applicant and in assisting him in making them available for cross-examination. If a person so invited is an officer or employee of the executive branch of the Government or a member of the armed forces of the United States, the head of the department or agency concerned shall cooperate in making that person available for cross-examination. ”